1. Unit sphereIn mathematics, a unit sphere is the set of points of distance 1 from a fixed central point, where a generalized concept of distance may be used; a closed unit ball is the set of points of distance less than or equal to 1 from a fixed central point. Usually a specific point has been distinguished as the origin of the space under study and it is understood that a unit sphere or unit ball is centered at that point. Therefore one speaks of "the" unit ball or "the" unit sphere.
Read “Unit sphere” on English Wikipedia
Read “単位球面” on Japanese Wikipedia
Read “Unit sphere” on DBpedia
Read “Unit sphere” on English Wikipedia
Read “単位球面” on Japanese Wikipedia
Read “Unit sphere” on DBpedia
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